Helium isotopes in geothermal and volcanic gases of the western United States, I. Regional variability and magmatic origin

Welhan, J. A.; Poredai, R.J.; Rison, W.; Craig, H.

doi:10.1016/0377-0273(88)90032-7

Cited by 76 publications

(24 citation statements)

References 28 publications

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“…3) of the calcite samples are consistent with a significant magmatic component. This signature is similar to the present-day gas analyses from steam samples taken from both the Devil's Kitchen fumarole area (Welhan et al,1988) and from Cos0 production wells.…”

Section: -72supporting

confidence: 75%

Federal Geothermal Geoscience Research Fiscal Year 1998

1999

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Section: -72supporting

confidence: 75%

Federal Geothermal Geoscience Research Fiscal Year 1998

1999

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“…The heat anomaly in the EMB may indeed be a result of crustal thinning, but the source of the 3 He m flux into the basin is not magma intrusion; rather, we argue that active faults penetrate the thinned crust to considerable depth to transfer heat and volatiles to the shallow groundwater systems. Much like 3 He m in hydrothermal systems, which is localized by hot water advection, helium-3 in extensional basins may be associated with localized flow through higher permeability fault zones (Welhan et al, 1988). The shallow thermal maximum (275 m) in the eastern EMB supports the hypothesis of upflow and lateral transfer of fluids, possibly through the fault system (Trexler et al, 1984).…”

Section: Thermal and Gravity Anomalies In The Embmentioning

confidence: 91%

Source and movement of helium in the eastern Morongo groundwater Basin: The influence of regional tectonics on crustal and mantle helium fluxes

Kulongoski

Hilton

Izbicki

2005

Geochimica et Cosmochimica Acta

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“…The gas composition is quite constant through time, and the geothermometer temperatures are all around 210 ‡C, indicating that the steam discharge is from a high-temperature hydrothermal system. The helium isotopic value referenced to air is 6.23 (Welhan et al, 1988), indicating a mantle component as the source of the helium in the gases associated with the steam. Because we have no sample of the water phase from the hydrothermal system that boils to produce the gases feeding the spring at the summit of Mount Shasta, it is only possible to make an indirect case that this is the system that feeds the thermal component of the Shasta Valley springs.…”

Section: Shasta Valley Springsmentioning

confidence: 99%

Slightly thermal springs and non-thermal springs at Mount Shasta, California: Chemistry and recharge elevations

Nathenson

Thompson

White

2003

Journal of Volcanology and Geothermal Research

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Temperature measurements, isotopic contents, and dissolved constituents are presented for springs at Mount Shasta to understand slightly thermal springs in the Shasta Valley based on the characteristics of non-thermal springs. Non-thermal springs on Mount Shasta are generally cooler than mean annual air temperatures for their elevation. The specific conductance of non-thermal springs increases linearly with discharge temperature. Springs at higher and intermediate elevations on Mount Shasta have fairly limited circulation paths, whereas low-elevation springs have longer paths because of their higher-elevation recharge. Springs in the Shasta Valley are warmer than air temperatures for their elevation and contain significant amounts of chloride and sulfate, constituents often associated with volcanic hydrothermal systems. Data for the Shasta Valley springs generally define mixing trends for dissolved constituents and temperature. The isotopic composition of the Shasta Valley springs indicates that water fell as precipitation at a higher elevation than any of the non-thermal springs. It is possible that the Shasta Valley springs include a component of the outflow from a proposed 210 ‡C hydrothermal system that boils to supply steam for the summit acid-sulfate spring. In order to categorize springs such as those in the Shasta Valley, we introduce the term slightly thermal springs for springs that do not meet the numerical criterion of 10 ‡C above air temperature for thermal springs but have temperatures greater than non-thermal springs in the area and usually also have dissolved constituents normally found in thermal waters. ß

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Helium isotopes in geothermal and volcanic gases of the western United States, I. Regional variability and magmatic origin

Cited by 76 publications

References 28 publications

Federal Geothermal Geoscience Research Fiscal Year 1998

Federal Geothermal Geoscience Research Fiscal Year 1998

Source and movement of helium in the eastern Morongo groundwater Basin: The influence of regional tectonics on crustal and mantle helium fluxes

Slightly thermal springs and non-thermal springs at Mount Shasta, California: Chemistry and recharge elevations

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